Killian vs Casey

Baby Name Comparison — 2026

Killian

Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

✓ All Clear

Boy #310 Most Popular 2 Syllables

Irish English American

✓ All Clear

Killian Rank #370

Casey Rank #310

Casey is more popular, ranked #310 vs #370 for Killian.

Is Killian or Casey more popular?

Casey is more popular, ranked #310 compared to Killian at #370 in the United States.

What do Killian and Casey mean?

Killian means "associated with the church" (Irish Gaelic origin).

Are Killian and Casey boy or girl names?

Killian is primarily a boy name. Casey is primarily a boy name.